I installed the indicator-multiload 0.2-0ubuntu1 from the software center. (It's very similar to the gnome panel indicator showing memory and CPU graphs)
When I click on the Unity panel which shows the little memory graph, it says ;
Mem :1.451 GB Cache: 2.581. This is also represented in the color graph.
However, when I load the System Monitor, SWAP is at a flat 0.
Is this normal, or could there be a bug in either the System Monitor or Panel Indicator?